Nature is usually wrong.

The world is divided into two classes - invalids and nurses.

Truly color is vice! Of course, it can be, and has the right to be one of the finest virtues. Controlled by the strong hand and careful guidance of her Master drawing, color is a splendid Mistress, with a mate worthy of herself, her lover, but her Master likewise, the most magnificent Mistress possible, and the result is evident in all the glorious things that spring from their union.

Paint should not be applied thick. It should be like a breath on the surface of a pane of glass.

To say to the painter that Nature is to be taken as she is, is to say to the player that he may sit on the piano.

A picture is finished when all trace of the means used to bring about the end has disappeared.

If other people are going to talk, conversation becomes impossible.